#exit{/*默认*/
    -fx-background-color: Transparent/*透明*/
    -fx-background-radius 0
    -fx-border-radius 0
}

#exit:hover{/*鼠标事件：划过*/
    -fx-background-color: Gainsboro/*略深的灰色*/
}

#exit:pressed{/*鼠标事件：按压*/
    -fx-background-color: GhostWhite/*浅浅浅灰*/
}

#minimize{
    -fx-background-color: white
}

#minimize:hover{
    -fx-background-color: Gainsboro
}

#minimize:pressed{
    -fx-background-color: GhostWhite
}